X4 PHARMACEUTICALS, INC. 5,670,000 Shares of Common Stock Pre-Funded Warrants to Purchase 2,130,000 Shares of Common Stock Class A Warrants to Purchase 3,900,000 Shares of Common Stock UNDERWRITING AGREEMENTUnderwriting Agreement • April 15th, 2019 • X4 Pharmaceuticals, Inc • Biological products, (no disgnostic substances) • New York
